Oct 18, 2019 If you're using an earlier macOS, such as macOS High Sierra, Sierra, El Capitan, or earlier,. follow these steps to keep it up to date. Open the App Store app on your Mac. Click Updates in the App Store toolbar. Use the Update buttons to download and install any updates listed. Pages is a powerful word processor that lets you create stunning documents. You can even use Apple Pencil on your iPad to add comments and illustrations by hand. And with real-time collaboration, your team can work together, whether they’re on Mac, iPad, or iPhone, or using a PC. In OS X Yosemite and earlier, one of the first things to do when encountering an app that won't launch is to repair permissions to make sure the application and any associated files it needs have the correct permissions required to run. File permissions can get wacky once in a while.
A serious vulnerability present in every iteration of Apple's desktop operating system since OS X 10.7 — Â one which allows any user process to gain root privileges — Â was disclosed to the public on Thursday following the release of OS X 10.10.3, which addresses the issue, and users are urged to update as older OS X versions will remain susceptible to attack.
The problem revolves around an unpublished OS X API used by system processes, like System Preferences, for privilege escalation. TrueSec's Emil Kvarnhammar discovered that any OS X user, whether or not their account possesses administrative rights, could gain root access by exploiting this API.
This presents a critical security threat for users of unpatched OS X versions. Users who unwittingly install malware containing exploit code could hand over complete control of their Mac to the attacker, no matter what other security precautions they may have taken.
As a result, OS X users are urged to upgrade to Yosemite version 10.10.3 as soon as possible. Apple will not patch versions older than 10.10, reportedly due to the complexity of the fix.
For users running OS X 10.10, 10.10.1, or 10.10.2, a patch for this bug is included in Security Update 2015-004.
Kvarnhammar first discovered the vulnerability in OS X Mavericks last October, and reported it to Apple immediately. The company asked Kvarnhammar to postpone public disclosure — Â which generally occurs within 90 days of discovery — 'due to the amount of changes required in OS X,' and a full fix was not implemented until this week.
AppleInsider has affiliate partnerships and may earn commission on products purchased through affiliate links. These partnerships do not influence our editorial content.
Check compatibility
You can upgrade to OS Yosemite on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8GB of available storage space.
MacBook introduced in 2009 or later, plus MacBook (13-inch, Aluminum, Late 2008)
MacBook Air introduced in late 2008 or later
MacBook Pro introduced in mid 2007 or later
Mac mini introduced in early 2009 or later
iMac introduced in mid 2007 or later
Mac Pro introduced in early 2008 or later
Xserve models introduced in early 2009
MacBook Air introduced in late 2008 or later
MacBook Pro introduced in mid 2007 or later
Mac mini introduced in early 2009 or later
iMac introduced in mid 2007 or later
Mac Pro introduced in early 2008 or later
Xserve models introduced in early 2009
To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with OS X Yosemite, the installer will let you know.
Make a backup
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Get connected
It takes time to download and install OS X, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.
Download OS X Yosemite
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS.
If you still need OS X Yosemite, use this link: Download OS X Yosemite. A file named InstallMacOSX.dmg will download to your Mac.
Install the macOS installer
Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallMacOSX.pkg.
Follow the onscreen instructions, which will guide you through the steps necessary to install.
Update Yosemite Os
Begin installation
After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install OS X Yosemite.
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
Allow installation to complete
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both OS X and related updates to your Mac firmware.
Learn more
Mac Os Update From Yosemite
- OS X Yosemite won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.
- You can use macOS Recovery to reinstall macOS.